Baxi System 100 HE Plus Installation & Servicing Instructions Manual page 44

ELECTRICAL SUPPLY
240V at A ?
YES
240V at B ?
YES
PCB fuse OK ?
YES
Replace PCB.
44
Lights
ON
No Switched Live to
NO
boiler. Check Systems
Controls and System
Wiring.
NO
Check wiring from
terminal block to PCB.
Check for shorts on
NO
pump, fan & gas valve.
Replace if shorted &
replace fuse.
15.0
Off
Off
Off
Fuse
Fault Finding
A
N Optional
L
Pump
Live
B